CN109103221A - Pixel defining layer and its prepare raw material and preparation method, display base plate - Google Patents

Pixel defining layer and its prepare raw material and preparation method, display base plate Download PDF

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Publication number
CN109103221A
CN109103221A CN201810943500.7A CN201810943500A CN109103221A CN 109103221 A CN109103221 A CN 109103221A CN 201810943500 A CN201810943500 A CN 201810943500A CN 109103221 A CN109103221 A CN 109103221A
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defining layer
pixel defining
lyophily
pixel
layer
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CN109103221B (en
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李伟
夏晶晶
周斌
王东方
赵策
胡迎宾
宋威
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to US16/452,773 priority patent/US10870752B2/en
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Abstract

The present invention provides a kind of pixel defining layer and its raw material and preparation method, display base plate are prepared, is related to field of display technology.The raw material for preparing of the pixel defining layer includes the following components'mass percentage: lyophobicity film forming polymer, the lyophily magnetic nanoparticle of 0.5%-1%, the photoinitiator of 0.5%-2%, the reaction monomers of 0.1%-1%, the additive of 0.1%-1% and the solvent of surplus of 5%-30%.By the synergistic effect for matching each component of composition above, it is capable of forming the pixel defining layer that lyophobicity to lyophily change of gradient is presented from top to bottom, pixel material solution can be effectively avoided to sprawl at the top of pixel region and pollute adjacent pixel, it can also make pixel material solution in the uniform drawout in pixel region bottom, to form pixel layer in homogeneous thickness.During the preparation process, lyophily magnetic nanoparticle can be induced by external magnetic field to the lower part for defining layer ontology, defined a layer body lower part lyophily characteristic to assign, be effectively simplified preparation process.

Description

Pixel defining layer and its prepare raw material and preparation method, display base plate
Technical field
The present invention relates to display technology, in particular to a kind of pixel defining layer and its raw material and preparation method, display are prepared Substrate.
Background technique
For organic electroluminescence device (Organic Light-Emitting Diode, OLED), liquid crystal display device The preparation of display devices such as (Liquid Crystal Display, LCD), generallys use water-laid film technique, such as ink-jet is beaten Print technique prints organic solution in the pixel region defined by pixel defining layer, forms pixel layer after drying.On the one hand, Adjacent pixel is polluted in order to avoid organic solution is sprawled at the top of pixel region, it is expected that the upper area of pixel defining layer is in thin Fluidity；On the other hand, in order to make organic solution in the uniform drawout in pixel region bottom, to form pixel layer in homogeneous thickness, It is expected that the bottom of pixel defining layer is in lyophily.
Currently, it is above-mentioned from top lyophobicity to the pixel defining layer of top lyophily in order to obtain, in preparation pixel circle When given layer, be respectively adopted lyophily raw material preparation lower half portion, and use lyophobicity raw material prepare top half, and respectively into Row patterning is to form pixel region.
However, above-mentioned preparation method increases process complexity.
Summary of the invention
In consideration of it, the present invention provides a kind of pixel defining layer and its prepares raw material and preparation method, display base plate, can solve Above-mentioned technical problem.Specifically, including technical solution below:
On the one hand, provide a kind of pixel defining layer prepares raw material, and the raw material for preparing includes following mass percent Component: the lyophobicity film forming polymer of 5%-30%, the lyophily magnetic nanoparticle of 0.5%-1%, 0.5%-2% light The solvent of initiator, the reaction monomers of 0.1%-1%, the additive of 0.1%-1% and surplus.
In one possible implementation, the additive is in polymerization inhibitor, levelling agent, defoaming agent, stabilizer It is at least one.
In one possible implementation, the lyophily magnetic nanoparticle includes: magnetic nanoparticle, is coated on Coupling agent outside the magnetic nanoparticle grafts on the lyophily polymer for having coupling agent surface.
In one possible implementation, the magnetic nanoparticle is ferroferric oxide nano granules；
The coupling agent is silica；
The lyophily polymer is polymethyl methacrylate-ethylene glycol monomethyl ether methacrylate.
On the other hand, a kind of preparation method of pixel defining layer is provided, the preparation method includes: to provide substrate base Plate；
The raw material for preparing of above-mentioned pixel defining layer is overlying on underlay substrate, wet film is formed；
The organic solvent in the wet film is removed, while inducing the lyophily magnetism in the wet film to receive by external magnetic field Rice grain is migrated to the side close to the underlay substrate, obtains transition film layer；
Patterned process is carried out to the transition film layer, obtains the pixel defining layer.
In one possible implementation, the external magnetic field is the electromagnet below the underlay substrate.
In one possible implementation, by adjusting at least one of following operating condition, to control the lyophily Distribution of the property magnetic nanoparticle in the pixel defining layer:
The magnetic field strength of the external magnetic field, the action time of the external magnetic field, the lyophily magnetic nanoparticle Mass concentration.
In another aspect, the pixel defining layer passes through above-mentioned picture the embodiment of the invention provides a kind of pixel defining layer The preparation method that element defines layer is prepared.
In one possible implementation, the pixel defining layer includes: to define a layer ontology；And it is doped in the boundary The lyophily magnetic nanoparticle of given layer body lower part；
Wherein, it is described define layer ontology by lyophobicity film forming polymer, reaction monomers photoinitiator effect under in solvent Middle progress polymerization reaction is prepared, and doped with additive.
In another aspect, the embodiment of the invention also provides a kind of display base plates, comprising: underlay substrate is set to the lining Above-mentioned pixel defining layer on substrate；And it is set to the pixel in the pixel region defined by the pixel defining layer Layer.
The beneficial effect of technical solution provided in an embodiment of the present invention includes at least:
Pixel defining layer provided in an embodiment of the present invention prepares raw material, the collaboration of each component by matching composition above Effect is capable of forming the pixel defining layer that lyophobicity to lyophily change of gradient is presented from top to bottom, in this way, one side energy It is enough that pixel material solution is effectively avoided to sprawl at the top of pixel region and pollute adjacent pixel, on the other hand, it can also make pixel former Solution is expected in the uniform drawout in pixel region bottom, to form pixel layer in homogeneous thickness.Wherein, lyophobicity film forming polymer, Reaction monomers carry out polymerization reaction under photoinitiator effect in solvent, and the lyophobicity that pixel defining layer can be prepared defines Layer ontology, and additive Uniform Doped defines the desired characteristic of layer ontology in layer ontology to assign in defining, such as surface is smooth Property.During the preparation process, lyophily magnetic nanoparticle can be induced by external magnetic field to the lower part for defining layer ontology, to assign It defines layer body lower part lyophily characteristic and is effectively simplified preparation to obtain the pixel defining layer of top lyophoby and lower part lyophily Technique.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing.
Fig. 1 is the preparation flow figure of lyophily magnetic nanoparticle provided in an embodiment of the present invention；
Fig. 2 is the preparation flow figure of pixel defining layer provided in an embodiment of the present invention.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into One step it is described in detail.
It should be noted that pixel defining layer includes: bounded area (the also known as area Bank), and by defining in display device The pixel region (also known as pixel openings area) that area is defined.Wherein, bounded area is directly formed by pixel defining layer.In order to solve mesh It is preceding during preparing pixel defining layer, need using two kinds in addition it is two or more parent, lyophobicity it is different prepare raw material, And complex process caused by being formed by multiple Patternized technique, the problems such as raw material limitation, the embodiment of the present invention is provided One kind can be used to prepare top lyophobicity, and the pixel defining layer of lower part lyophily prepares raw material.
Wherein, the top or top of pixel defining layer involved in the embodiment of the present invention, refers to that pixel defining layer is separate The side of underlay substrate, and the lower part of pixel defining layer or bottom refer to side of the pixel defining layer close to underlay substrate.
On the one hand, raw material is prepared the embodiment of the invention provides a kind of pixel defining layer comprising following quality percentage The component of ratio: the lyophobicity film forming polymer of 5%-30%, the lyophily magnetic nanoparticle of 0.5%-1%, 0.5%-2% The solvent of photoinitiator, the reaction monomers of 0.1%-1%, the additive of 0.1%-1% and surplus.
Pixel defining layer provided in an embodiment of the present invention prepares raw material, the collaboration of each component by matching composition above Effect is capable of forming the pixel defining layer that lyophobicity to lyophily change of gradient is presented from top to bottom, in this way, one side energy It is enough that pixel material solution is effectively avoided to sprawl at the top of pixel region and pollute adjacent pixel, on the other hand, it can also make pixel former Solution is expected in the uniform drawout in pixel region bottom, to form pixel layer in homogeneous thickness.Wherein, lyophobicity film forming polymer, Reaction monomers carry out polymerization reaction under photoinitiator effect in solvent, and the lyophobicity that pixel defining layer can be prepared defines Layer ontology, and additive Uniform Doped defines the desired characteristic of layer ontology in layer ontology to assign in defining, such as surface is smooth Property.During the preparation process, lyophily magnetic nanoparticle can be induced by external magnetic field to the lower part for defining layer ontology, to assign It defines layer body lower part lyophily characteristic and is effectively simplified preparation to obtain the pixel defining layer of top lyophoby and lower part lyophily Technique.
For each component of pixel defining layer prepared in raw material, the setting of quality proportioning must at least meet with Lower condition: have the pixel defining layer to be formed and desired define function；The pixel defining layer to be formed is set not influence display device Luminescent properties；The close and distant fluidity for the pixel defining layer to be formed is set to meet the requirement changed from top to bottom gradient.
For example, the mass percent of lyophobicity film forming polymer can for 5%, 7%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30% etc.；
The mass percent of lyophily magnetic nanoparticle can be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% Deng；
The mass percent of photoinitiator can be 0.5%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8% Deng；
The mass percent of reaction monomers can for 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% etc.；
The mass percent of additive can for 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% etc..
In one possible implementation, which prepares the group that raw material includes following mass percent Point: the lyophobicity film forming polymer of 10%-20%, the lyophily magnetic nanoparticle of 0.8%-1%, 0.8%-1.5% light The solvent of initiator, the reaction monomers of 0.1%-0.5%, the additive of 0.1%-0.5% and surplus.
In alternatively possible implementation, which prepares the group that raw material includes following mass percent Point: the lyophobicity film forming polymer of 5%-15%, the lyophily magnetic nanoparticle of 0.5%-0.9%, 0.5%-1% light draw Send out the solvent of agent, the reaction monomers of 0.5%-1%, the additive of 0.5%-1% and surplus.
For lyophobicity film forming polymer, be used to form the lyophobicity matrix of pixel defining layer, can for containing Fluoropolymer can be further fluorine-containing acryl polymer, for example, the fluorine-containing acryl polymer can be Copolymer (alternatively referred to as poly- (the methyl methacrylate-of methyl methacrylate (MMA) and dodecafluoroheptyl methacrylate Dodecafluoroheptyl methacrylate)), wherein methyl methacrylate mass percent wherein can for 85%-95% it Between, such as 90%, surplus is dodecafluoroheptyl methacrylate.
For photoinitiator, it is used to the initiation reaction monomer polymerization under illumination condition and is crosslinked, and then cooperate and dredge Fluidity film forming polymer, pixel defining layer is formed after solidification defines a layer ontology.As an example, photoinitiator can be nitre At least one of base aniline, anthraquinone, benzophenone.
For reaction monomers, polymerization reaction can be carried out under the initiation of photoinitiator, is shown as one kind Example, reaction monomers can be Dipentaerythritol Pentaacrylate, dipentaerythritol hexaacrylate, urethane acrylate and second Aoxidize at least one of pentaerythritol tetraacrylate.
For additive, at least one of polymerization inhibitor, levelling agent, defoaming agent, stabilizer can be selected from.Citing For, polymerization inhibitor can be hydroquinone, 2- sec-butyl -4,6- dinitrophenol, p-tert-Butylcatechol, the special fourth of 2,5- bis- Any one in base hydroquinone；Levelling agent can be acrylic compounds, organosilicon compound and fluorine carbon chemical combination Any one in object；Defoaming agent can be silicone emulsion, the fatty acid ester compounded object of higher alcohols, polyoxyethylene polyoxypropylene season penta Four alcohol ethers, polyoxyethylene polyoxy propyl alcohol amidogen ether, polypropylene glycerol aether, polyoxyethylene polyoxypropylene glycerin ether, poly dimethyl silicon At least one of oxygen alkane；Stabilizer can be at least one of isoamyl alcohol, n-hexyl alcohol, glycerine and n-hexane.
For organic solvent, ideal reaction environment is provided for polymerization reaction, illustratively, organic solvent can select From N-Methyl pyrrolidone, glycol ethers, ethylene glycol alkyl ether acetic acid esters, diethylene glycol (DEG), propylene glycol methyl ether acetate, acetic acid ethoxy Ethyl ester, dimethoxy acetaldehyde, propylene glycol methyl ether acetate, 3- ethoxyl ethyl propionate, propylene glycol monomethyl ether (abbreviation PM), acetic acid second At least one of glycol ether.
For lyophily magnetic nanoparticle, lyophily is presented in the lower part for being used to assign pixel defining layer, both There is magnetism, in order to be migrated under the action of external magnetic field to the lower part of pixel defining layer during preparation, also to have Lyophily.In the embodiment of the present invention, lyophily magnetic nanoparticle includes: magnetic nanoparticle, is coated on magnetic nanoparticle The coupling agent of outside, the lyophily polymer for grafting on coupling agent surface.
Wherein, magnetic nanoparticle is used to provide magnetism, and lyophily polymer is used to assign lyophily, and coupling agent is used to Magnetic nanoparticle and lyophily polymer is set to carry out stable bond.
In view of having good compatibility with lyophobicity film forming polymer, illustratively, magnetic nanoparticle can be four Fe 3 O nano particle, as magnetic kernel；Coupling agent is silica, and as centre at playing protection magnetic kernel Effect；Lyophily polymer is polymethyl methacrylate (PMMA)-ethylene glycol monomethyl ether methacrylate (PEGMMA), is Block copolymer.
The chemical structural formula of the lyophily magnetic nanoparticle is as follows:
Wherein, m is integer, and value range is 20~100；N is integer, and value range is that 20~100, x is integer, value Range is 2~6.For example, m=50, n=50, x=4.
For the lyophily magnetic nanoparticle of above structure, and Fig. 1 illustrates the system of lyophily magnetic nanoparticle In conjunction with Fig. 1 lyophily magnetic nanoparticle can be prepared using following methods in standby process:
In one possible implementation, by 1g Fe3O4Magnetic nano-particle (commercially available, partial size 5nm) and 0.1g silane Coupling agent KH560 is in 20mL water (H2) and ethyl alcohol (CH O3CH2OH in the mixed solvent) stirs 2 hours under the conditions of 80 DEG C, preparation Obtaining surface adhesion has SiO2The Fe of thin layer3O4/SiO2Nanoparticle.Then, 5mL ammonium hydroxide is added into above-mentioned reaction system (NH3H2O it) is prepared with 0.5g ethyl orthosilicate (TEOS), room temperature reaction 12 hours, filtering, ethyl alcohol cleaning, pure water cleaning, drying Obtain magnetic Fe3O4/SiO2Particle.
By the magnetic Fe of above-mentioned preparation3O4/SiO2The 3- aminopropyl three for being 10% containing mass concentration of 20mL is added in particle In toluene (Toluene) solution of Ethoxysilane (APTES), 120 DEG C of reflux 12h in nitrogen are centrifuged after cooling, collect lower layer Precipitating is dispersed with 50mL ethyl alcohol, and lower sediment is collected in centrifuge separation, is so repeated three times, and precipitating is collected, dry, obtains Fe3O4/ SiO2-NH2Particle.By Fe3O4/SiO2-NH220mL methylene chloride (CH is added in particle2CL2) in, 0.2mL triethylamine is added (TEA), cooling system temperature is slowly dropped into bromo isobutyl acylbromide to 0 DEG C in ice bath0.18mL is anti-in ice bath After answering 2h, the reaction was continued for room temperature for 24 hours, and filtering, ethyl alcohol rinses, pure water rinsing, dry, obtains Fe3O4/SiO2- Br particle.
By Fe3O4/SiO2- Br particle is added to dispersion in cyclohexanone in 5mL (CycloHexanone), and then inflated with nitrogen is set 0.2g methyl methacrylate (MMA), 70mg bipyridyl (Bpy) and 20mg are added under nitrogen atmosphere for air in the system that swaps out CuBr, nitrogen atmosphere lower 90 DEG C of reactions 12h, it is cold go after be centrifuged, collect lower sediment, dispersed with 50mL tetrahydrofuran, centrifugation point It from lower sediment is collected, so repeats three times, collects precipitating, it is dry, obtain Fe3O4/SiO2/ PMMA particle.
By Fe3O4/SiO2/ PMMA particle, which is added in 5mL cyclohexanone, to be dispersed, and then inflated with nitrogen displaces air in system, 0.5g glycol monoethyl ether methacrylate (EGMMA), 70mg bipyridyl (Bpy) and 20mg CuBr are added under nitrogen atmosphere, Nitrogen atmosphere lower 90 DEG C of reactions 12h, it is cold go after be centrifuged, collect lower sediment, dispersed with 50mL tetrahydrofuran, centrifuge separation is collected Lower sediment so repeats three times, collects precipitating, dry, obtains final target lyophily magnetic nanoparticle Fe3O4/ SiO2/ PMMA-PEGMMA, after tested, partial size are 10nm or so.
On the other hand, the embodiment of the invention provides a kind of preparation methods of pixel defining layer, as shown in Fig. 2, the system Preparation Method includes: offer underlay substrate.
The raw material for preparing of above-mentioned pixel defining layer is overlying on underlay substrate, wet film is formed.
It removes the solvent in based Dehumidification Membranes, while inducing the lyophily magnetic nanoparticle in wet film to close by external magnetic field The side of underlay substrate migrates, and obtains transition film layer.
Patterned process is carried out to transition film layer, obtains pixel defining layer.
In pixel defining layer preparation process, make lyophily magnetic nanoparticle to close to underlay substrate by external magnetic field Side migration, so that it is finally distributed in the lower part of pixel defining layer, assign its lyophily.It can guarantee that pixel material solution does not exist Pollution adjacent pixel is sprawled at top, and is uniformly sprawled inside pixel region.
In one possible implementation, the raw material for preparing of pixel defining layer can be covered by way of inkjet printing In on underlay substrate.The process of dry wet film is exactly to remove the process of solvent, for example, can pass through side that is dry and depressurizing Formula handles wet film, to remove solvent therein.Above-mentioned patterned process includes the techniques such as exposure, development, solidification, in transition Multiple pixel regions are formed in film layer, finally obtain desired pixel defining layer.
In one possible implementation, external magnetic field is the electromagnet below underlay substrate, can be located at lining The underface of substrate, opens electromagnet in removing based Dehumidification Membranes while solvent, lyophily magnetic nanoparticle can be made to leaning on The side migration of nearly underlay substrate, so that the concentration of the lyophily magnetic nanoparticle inside transition film layer be made to present from top to bottom Increase distribution.Then, experience includes front baking, exposure, development, cured patterned process, forms the pixel defining layer knot of trapezoid Structure.Wherein, it exposes, in developing process, mask plate can be used to carry out.
In one possible implementation, the magnetic field strength that above-mentioned electromagnet provides can be 0.01T~0.2T, magnetic field Action time can be 10~100s.
Wherein, by adjusting at least one of following operating condition, to control lyophily magnetic nanoparticle in pixel circle Distribution in given layer: the magnetic field strength of external magnetic field, the action time of external magnetic field, the quality of lyophily magnetic nanoparticle are dense Degree.
By control lyophily magnetic nanoparticle in the content distribution for defining layer body interior, may be implemented to define layer sheet Different close and distant fluidities is presented at body different location.And in order to make distribution of the lyophily magnetic nanoparticle in pixel defining layer Reach expectation, orthogonal test early period can be done before preparation, for example, an experiment can be provided with defining a layer ontology, Lyophily magnetic nanoparticle is inside distributed with.It is during orthogonal test, three above factor: the magnetic field of external magnetic field is strong Degree, the action time of external magnetic field, lyophily magnetic nanoparticle mass concentration as experiment condition, can be with one wherein In the case of experiment condition determines, change its distribution situation by changing other two experiment condition, alternatively, can be wherein In the case of two experiment conditions determine, change its distribution situation by changing remaining experiment condition.
Wherein, lyophily magnetic nanoparticle be distributed in the distribution length in pixel defining layer can be with the thickness of pixel layer It is at the same level.
In a kind of possible example, it is expected that the lower half portion of pixel defining layer is lyophily, and pixel defining layer is upper Half portion is divided into lyophobicity.
In alternatively possible example, it is expected that the lower part from bottom at 1/3 height of pixel defining layer is lyophily, Rest part is lyophobicity.
On the other hand, the embodiment of the invention also provides a kind of pixel defining layers, and the pixel defining layer is according to above-mentioned pixel The preparation method for defining layer is prepared using the above-mentioned raw material for preparing.
Wherein, which includes: to define a layer ontology；And it is doped in the lyophily magnetism for defining layer body lower part Nano particle.Wherein, define layer ontology by lyophobicity film forming polymer, reaction monomers photoinitiator effect under in solvent into Row polymerization reaction is prepared, and doped with additive, also, additive is uniformly distributed in defining layer ontology.
It is understood that defining has multiple open regions on layer ontology, using as pixel region.
Pixel defining layer provided in an embodiment of the present invention by the filler pixels material solution into pixel region, such as is adopted It is filled with inkjet printing mode, is then solidified.Lyophoby is presented from top to bottom due to pixel defining layer Property to lyophily change of gradient, in this way, on the one hand can effectively avoid pixel material solution from sprawling at the top of pixel region and dirty Adjacent pixel is contaminated, on the other hand, can also make pixel material solution in the uniform drawout in pixel region bottom, it is uniform to improve film forming Property, to form pixel layer in homogeneous thickness.
In another aspect, the embodiment of the invention also provides a kind of display base plate, the display includes: underlay substrate substantially, also It include: the pixel defining layer being set on underlay substrate；And it is set in the pixel region defined by pixel defining layer Pixel layer.
Based on having used above-mentioned pixel defining layer, when forming pixel layer in pixel region, it is easier to it is equal to obtain thickness Pixel layer that is even, and being independent of each other each other, and then display base plate is made to obtain more preferably luminescent properties.
It will be appreciated by persons skilled in the art that the above-mentioned underlay substrate being related to can include: substrate and be set to base Functional film layer on bottom, for example with film crystal luminescent device, used underlay substrate may include film crystal two Pole pipe and the anode layer being provided thereon.Alternatively, for example with quantum dot light emitting device, used underlay substrate can wrap Include transparent conductive electrode substrate, the hole transmission layer being cascadingly set in transparent conductive electrode substrate, quantum dot light emitting layer, Electron transfer layer and metal electrode.
Above-mentioned display base plate can be prepared by following preparation method: provide underlay substrate.
According to the preparation method of above-mentioned pixel defining layer, pixel defining layer is formed on underlay substrate.
Into the pixel region defined by pixel defining layer, filler pixels layer material liquid, is dried, and is obtained cured Pixel layer.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this Within the protection scope of invention.

Claims (10)

1. a kind of pixel defining layer prepares raw material, which is characterized in that described to prepare the group that raw material includes following mass percent Point: the lyophobicity film forming polymer of 5%-30%, the lyophily magnetic nanoparticle of 0.5%-1%, 0.5%-2% it is light-initiated Agent, the reaction monomers of 0.1%-1%, the additive of 0.1%-1% and surplus solvent.
2. pixel defining layer according to claim 1 prepares raw material, which is characterized in that the additive is selected from polymerization inhibitor At least one of agent, levelling agent, defoaming agent, stabilizer.
3. pixel defining layer according to claim 2 prepares raw material, which is characterized in that the lyophily magnetic Nano Grain includes: magnetic nanoparticle, the coupling agent being coated on outside the magnetic nanoparticle, grafts on the coupling agent surface Lyophily polymer.
4. pixel defining layer according to claim 3 prepares raw material, which is characterized in that the magnetic nanoparticle is four Fe 3 O nano particle；
The coupling agent is silica；
The lyophily polymer is polymethyl methacrylate-ethylene glycol monomethyl ether methacrylate.
5. a kind of preparation method of pixel defining layer, which is characterized in that the preparation method includes: offer underlay substrate；
The raw material for preparing of the described in any item pixel defining layers of claim 1-4 is overlying on underlay substrate, wet film is formed；
The organic solvent in the wet film is removed, while inducing the lyophily magnetic Nano in the wet film by external magnetic field Grain is migrated to the side close to the underlay substrate, obtains transition film layer；
Patterned process is carried out to the transition film layer, obtains the pixel defining layer.
6. the preparation method of pixel defining layer according to claim 5, which is characterized in that the external magnetic field is positioned at institute State the electromagnet below underlay substrate.
7. the preparation method of pixel defining layer according to claim 5, which is characterized in that by adjusting following operating condition At least one, to control distribution of the lyophily magnetic nanoparticle in the pixel defining layer:
The magnetic field strength of the external magnetic field, the action time of the external magnetic field, the lyophily magnetic nanoparticle matter Measure concentration.
8. a kind of pixel defining layer, which is characterized in that the pixel defining layer passes through the described in any item preparations of claim 5-7 Method is prepared.
9. pixel defining layer according to claim 8, which is characterized in that the pixel defining layer includes: to define a layer ontology； And it is doped in the lyophily magnetic nanoparticle for defining layer body lower part；
Wherein, it is described define layer ontology by lyophobicity film forming polymer, reaction monomers photoinitiator effect under in solvent into Row polymerization reaction is prepared, and doped with additive.
10. a kind of display base plate, comprising: underlay substrate, which is characterized in that the display base plate further include: be set to the lining Pixel defining layer described in claim 8 or 9 on substrate；And
The pixel layer being set in the pixel region defined by the pixel defining layer.
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